Improvement in ore-mills



H. K. BRAKE. Ore-M111.

No. 197,349. Patented Nov. 20, 1877..

N. PEIERS. PMoTo-LlrHoGRAPHEn, wAsHmBToN. n C,

PATENT HORACE K.'DRAKE, 0F- BROOKLYN, NEW YORK.

' IMPROVEMENT IN ORE-MILLS.

Specification forming partvof Letters Batent No. 191349, dated November `2O, 1877 `application filed November s, 1877.

will enable others skilled in the art to which it appertains to make and use the same, reference being had to theaccompanying drawings, and to the letters of .reference marked thereon, which form a part of this specification.

This invention has for its object to remove the rust from the gold contained in a mass of stones, gravel, and sand'by disintegratingsuch mass, by causing amutual attrition of the particles against themselves by revolving the mass, and'thereby rendering the gold mingledtherewith capable of amalgamating with mercury. In order to carry out my invention, I use a cylinder of peculiar construction, as will be hereinafter more fully set forth.

In the annexed drawings, which fully illustrate my invention, and to which reference is made, Figure l is a side elevationof my improved cylinder; and Fig. 2 is atransverse vertical section of the same through the line 4.fr x, Fig. l.

The cylinder is composed of a series of `parallel bars, AA, arranged in cylindrical form,

` and held together by means of interior rings B and exterior bands C; The bars A are made in T shape--that isto say, each bar-has a lon gitudinal rib or ange, a,'in the center, on its innerside, and extending the entire length of the bar.

The cylinder thusformed is supported in a` slightly-inclined position upon flanged rollers D D, the exterior bands C resting upon said rollers, and forming tracks for thecylinder, and the flanges on the rollers preventing any` endwisemotion ofthe cylinder in tion-of the incline.

The cylinder is inclined from the end where .the material is fed through the hopper or feedspoutE'to the opposite end, where the stones, L after being subjected to the process, are delivered.

At the lower or delivery end of the cylinder is secureda bevel-cogged rim,G, whichmeshes with a bevel-pinion, b, .upon the end of the the direc-1 driving-shaft d, said shaft`being driven by a belt or any other suitable means, so as to rotate the cylinder.

rEhe bars A A, forming the periphery ofthe cylinder, are placed close together, so as to form a closed cylinder from'the elevated or feed end downward for about 'one-half the length of the cylinder, more or less.` For the remaining portion of the cylinder the bars are slightly reduced in width, so as to form lon gitudinal slots, as shown at i i.

Below the cylinder is the usual inclined bottom H, with a lower central discharge-opening, I, and below said openingfis an inclined conveyer, J, terminating in a gold-saver, K. Within the conveyer is a series of upright partitions, m, and on the inside of the lower portion of the cross-.partitions n is placed a bed of quicksilver, x, while above the same is arranged a series of agitators, p.

The stone, gravel, and sand are fed into the upper end of the cylinder in large quantities, and, the cylinder being rotated, such material is carried up by the interior ribs or flanges a., and is ground, by attrition of the particles, in such a manner as to cause an entire separation of the stones from the sand, and scouring or cleaning the rust or sulphur from the gold. The upper end of the cylinder being closed, this scouring or cleaning is complete before any of the material can escape from the cylinder; but if not fully completed while in the -olosed portion of the cylinder, it is done while passing through the lower slotted portion of the cylinder, from whence the gold, sand, and

, /ine gravel pass through the slots i, while the stones are discharged over the end of the cylinder.

The sand, gravel, and gold pass over the inclined bottom down into the gold-saver, where they go through the usual process for collecting the gold and discharging the other matter.

By this means it will be observed that a large quantity of material which'V has heretofore been almost entirely worthless can be worked up and used at a great prot, and saving a .vast amount of valuable metal.

It must, of course, be understood that the device will be made unusually strong, and it will have to support tons upon tons of the manal slots, substantially for the herein set forth.

2. Aninclinedrevolvingcylinderconstructed of a series of hairsA T-sh-apedi in cross-section,

, connected together and arrangedto form aportion of the cylinder close, the remaining portion slotted, and a series of longitudinal ribs or Bange-s on the inside, all substantially as' and forthe purposes herein set forth.

In testimony that I claim the foregoing as my own I have hereto amared my signature in presence of two witnesses.

HORACE K. DRAKE.

Witnesses O. H. WATSON, FRANK GALLT.' 

